Samim’s Law of Diminished Experience:
The quantity of photos one takes (an attempt to save a tiny sliver of the present experience for later replay) is inversely correlated with the quality of the present moment experience.
Example: The more you look at your phone, the less you'll experience the actual sunset.
Discussion around this law can be found in this thread:
Thanks to Greg Lloyd for naming the law & everyone who made suggestions.
Related links, recommended by the community:
"Take a Picture, You'll Enjoy It More - Photographing experiences usually increases positive feelings about them, study says": http://www.apa.org/news/press/releases/2016/06/picture-enjoy.aspx << Notice this study speaks only about "enjoyment", nevertheless fascinating.